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-10x+90=-21+2
We move all terms to the left:
-10x+90-(-21+2)=0
We add all the numbers together, and all the variables
-10x+90-(-19)=0
We add all the numbers together, and all the variables
-10x+109=0
We move all terms containing x to the left, all other terms to the right
-10x=-109
x=-109/-10
x=10+9/10
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